SDCL § 45-4-15: Actions involving mining claims--Proof of customs, usages, or regulations.

In actions respecting mining claims, proof must be admitted of the customs, usages, or regulations established and in force at the bar or diggings embracing such claim; and such customs, usages, or regulations, when not in conflict with the laws of this state and of the United States, must govern the decision of the action.